<!--
 * Tencent is pleased to support the open source community by making BK-JOB生物智算平台 available.
 *
 * Copyright (C) 2021 THL A29 Limited, a Tencent company.  All rights reserved.
 *
 * BK-JOB生物智算平台 is licensed under the MIT License.
 *
 * License for BK-JOB生物智算平台:
 *
 *
 * Terms of the MIT License:
 * ---------------------------------------------------
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
 * to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of
 * the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
 * THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
-->

<script>
  import _ from 'lodash';

  import Mixin from './mixin';

  export default {
    name: 'BKSearchKey',
    mixins: [Mixin],
    data() {
      return {
        condition: {},
        list: [],
        activeIndex: -1,
      };
    },

    computed: {
      needRender() {
        // 没有选中key，且输入框中没有输入值
        if (!this.searchSelect.menu.id && this.searchSelect.localValue === '') {
          return true;
        }
        return false;
      },
      isCondition() {
        const { searchSelect } = this;
        if (searchSelect.chipList.length < 1) {
          // 条件筛选不能作为第一项
          return false;
        }
        if (searchSelect.chipList[searchSelect.chipList.length - 1][searchSelect.primaryKey]
          !== searchSelect.defaultCondition[searchSelect.primaryKey]) {
          // 已选的最后一项是条件筛选，则下一次操作不展示
          return false;
        }
        return this.searchSelect.showCondition;
      },
    },
    created() {
      // eslint-disable-next-line no-underscore-dangle
      this.generatorList = _.debounce(this._generatorList, 100);
    },
    mounted() {
      document.body.addEventListener('keydown', this.handleKeydown);
    },
    beforeDestroy() {
      this.activeIndex = -1;
      document.body.removeEventListener('keydown', this.handleKeydown);
    },
    methods: {
      _generatorList() {
        const {
          primaryKey,
          data,
          chipList,
        } = this.searchSelect;

        const selectKeyMap = chipList.reduce((result, item) => {
          result[item[primaryKey]] = true;
          return result;
        }, {});

        const stack = [];
        data.forEach((item) => {
          if (!selectKeyMap[item[primaryKey]]) {
            stack.push(item);
          }
        });
        this.list = Object.freeze(stack);
      },
      handleKeydown(event) {
        if (!this.needRender) {
          return;
        }
        // 取消选中状态
        if (event.keyCode === 27) {
          this.activeIndex = -1;
          return;
        }
        // enter键直接触发选中
        if (event.keyCode === 13 && this.activeIndex > -1) {
          this.handleClick(this.list[this.activeIndex], this.activeIndex);
          return;
        }
        this.scrollActiveToView(event);
      },

      handleClick(item, index) {
        this.$emit('select', item, index);
      },

      handleCondition() {
        this.$emit('select-conditon', this.condition);
      },
    },
    render(h) {
      if (!this.needRender) {
        return null;
      }

      const {
        condition,
        displayKey,
      } = this.searchSelect;

      const renderCondition = () => {
        if (!this.isCondition) {
          return '';
        }
        return (
                <div class="search-condition" onClick={this.handleCondition}>
                    {condition[displayKey]}
                </div>
        );
      };

      const renderList = (h) => {
        if (this.list.length < 1) {
          return (
                    <div class="search-loading">{ this.searchSelect.remoteEmptyText }</div>
          );
        }
        return (
                <ul ref="list" class="search-menu">
                    { this.list.map((item, index) => (
                        <li
                            class={{
                                'search-menu-item': true,
                                active: index === this.activeIndex,
                            }}>
                            <div class="item-name" onClick={() => this.handleClick(item, index)}>
                                <span>{ item[displayKey] }</span>
                                {
                                    item.description ? <span class="item-description">({item.description})</span> : ''
                                }
                            </div>
                        </li>
                    )) }
                </ul>
        );
      };

      return (
            <div class="jb-bk-search-list" role="key-menu" tabIndex="-1">
                { renderCondition(h) }
                { renderList(h) }
            </div>
      );
    },
  };
</script>
